JP2001324389A - Infrared temperature detector and steam trap inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute temperature detection or the like without executing a sensitivity switching operation by a worker. SOLUTION: This detector is equipped with a radiation temperature sensor 111 for detecting an infrared ray emitted from a steam trap, a temperature value operation part 26 for converting the detected value into a temperature value on each of plural infrared emissivities, a user input part 22 for inputting an evaluation temperature parameter for evaluating the temperature value, and a temperature determination part 27 for obtaining an evaluation temperature value by using the inputted evaluation temperature parameter, and determining a detection temperature based on the evaluation temperature value from among the plural temperature values obtained by the temperature value operation part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared temperature detector used for checking the condensate discharge performance of a steam trap, for example.

[0002]

2. Description of the Related Art Devices using steam as a heating medium,
In a steam piping system that supplies steam to them, condensate occurs due to heat exchange and heat radiation. If this condensate stays in the system, the operation efficiency is reduced, so that the condensate must be quickly discharged out of the system. When there is no condensate, useless steam discharge must be prevented. The steam trap is a steam valve that is attached to a steam piping system to open steam when condensate occurs, closes after condensate discharge, and shuts off steam in order to use steam effectively.

Many factories that use steam traps,
In particular, in large plants that have thousands to 10,000 or more steam traps, check the steam traps regularly at a rate of once or twice a year, and replace defective steam traps. We are trying to maintain it. Defective steam traps can be broadly classified into two types: steam leakage due to abrasion of the valve section, and condensate retention due to clogging of the valve section.

[0004] In the latter case, impurities such as rust and debris in the piping adhere to the valve port and cause clogging, and condensate is not smoothly discharged. Will not be discharged. As a method of checking for clogging or blockage of a steam trap, generally, a surface thermometer composed of a thermocouple or a thermistor is often pressed against the inlet side surface of the steam trap to detect the temperature.

[0005] The steam trap is used under a certain steam pressure. When the steam trap is operating normally, the inlet-side surface temperature is set to a value substantially close to the saturated steam temperature for the used steam pressure. Become. Conversely, when clogging occurs, the condensed water stays near the inlet of the steam trap or on the upstream side, and the temperature decreases due to heat radiation, so that the temperature value is much lower than the saturated steam temperature.

Accordingly, if the steam pressure used is known,
"Clogging" by detecting the temperature with the surface thermometer
Can be determined whether or not there is a blockage. However, there are several problems with using the surface thermometer for such purposes.

The temperature detecting portion of the surface thermometer is composed of a round plate made of a material having high heat conductivity called a heat collecting plate and a temperature sensor such as a thermistor or a thermocouple attached to the back side (inside) of the flat plate. However, the heat collecting efficiency of the heat collecting plate is reduced by the surface condition of the steam trap. That is, as the rust on the surface of the steam trap progresses, the surface roughness becomes extremely large, and the heat collecting plate does not adhere to the measurement surface.
In this case, it is necessary to polish the measurement surface with a file or the like.

In addition, a certain amount of time is required for heating the heat collecting plate, that is, for pressing against the object to be measured (15 to 30).
Seconds). In particular, in a low-temperature atmosphere such as winter, the heat radiation of the heat collecting plate becomes large, and the pressing time for sufficiently collecting the temperature further increases. Generally, in a regular inspection of a steam trap, the diagnosis of one steam trap must be performed in a few seconds to about 10 seconds.

In order to solve such a problem, there is a steam trap diagnostic device disclosed in Japanese Patent No. 2954183. This diagnostic device consists of a measuring device that detects the surface temperature and vibration of the steam trap, and a processor that diagnoses the steam trap based on the data and records the results one by one. An infrared temperature detector is used in the measuring instrument to detect. The infrared temperature detector is a non-contact type sensor that detects the intensity of infrared rays emitted from the target object and outputs an electric signal according to the intensity.As a tool for inspecting steam traps that require high speed, Basically, it is very useful to solve all the above problems.

[0010]

However, there is one problem in using this radiation temperature sensor. The intensity of infrared rays emitted by an object, that is, the infrared emissivity generally depends on the substance, and even if an object has the same temperature, the infrared emissivity is different for different substances. For this reason, the above-mentioned diagnostic device divides the range of the infrared emissivity of the steam trap into three parts in consideration of so-called surface properties such as the material and surface finish of the steam trap, and sets each part with three sensitivity changeover switches. I have to. At the time of steam trap inspection, it may be difficult to properly switch the sensitivity changeover switch if it is not used to some extent, and for an unskilled worker, forgetting to switch or making a mistake in switching may result in erroneous diagnosis. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an infrared temperature detector and an infrared temperature detector capable of accurately detecting the temperature of an object without performing a sensitivity switching operation by an operator. An object of the present invention is to provide a steam trap inspection apparatus provided with the steam trap inspection apparatus.

[0012]

In order to solve the above-mentioned problems, a first aspect of the present invention is an infrared temperature detector provided with an infrared ray detecting section for detecting the intensity of infrared rays emitted from a temperature detecting object. There are storage means for storing a plurality of infrared emissivities corresponding to the surface properties of the temperature detection target, and a detection value detected by the infrared detection unit as a temperature value for each of the plurality of infrared emissivities. A temperature value calculating means for converting, an evaluation temperature parameter input unit for inputting an evaluation temperature parameter for evaluating the temperature value, and an evaluation temperature value obtained by using the input evaluation temperature parameter; And a temperature determining means for determining a detected temperature based on the evaluation temperature value from among the plurality of temperature values obtained by the method.

According to this configuration, the intensity of infrared rays emitted from the temperature detection target is detected, and a temperature value for each infrared emissivity is obtained from the detected value using a plurality of infrared emissivities. Then, when the evaluation temperature parameter is input, from the plurality of temperature values obtained above,
Since one temperature value is determined as the detected temperature based on the evaluation temperature value obtained from the evaluation temperature parameter, if the infrared emissivity is set in advance, the switching operation of the infrared emissivity by the operator at the time of temperature detection is performed. The temperature of the object is detected without performing the (sensitivity switching operation) each time.

Further, if the apparatus has an emissivity input section for inputting a plurality of infrared emissivities and taking the infrared emissivity into the storage means, the infrared emissivity may be varied depending on the material characteristics of the object. Can be freely set or changed, so that the detection accuracy can be improved.

Further, the temperature detection object is used under a constant steam pressure, and the steam pressure to be used can be specified as in the case of a steam trap. For those which can be empirically understood to be a surface temperature close to the saturated steam temperature for the pressure, it is appropriate to use the saturated steam temperature as a guide of the temperature value. Therefore, the evaluation temperature parameter input unit inputs at least one of the working steam pressure value and the saturated steam temperature value with respect to the working steam pressure as the evaluation temperature parameter. According to this, the setting accuracy of the evaluation temperature parameter is set. Is not required and the setting is simplified.

Further, the temperature detection target is operated at a preset temperature, and
If the evaluation temperature parameter input unit is to input the preset temperature value as the evaluation temperature parameter, the operating temperature is set by adjusting a temperature-sensitive material such as a bimetal such as a temperature control trap. It is suitable for those who have.

Further, as set forth in claim 5, the temperature determining means minimizes a difference between the plurality of temperature values obtained by the temperature value calculating means and an evaluation temperature value specified by the evaluation temperature parameter. If the temperature value to be determined is determined as the detected temperature, there is no sensitivity switching error as in the conventional example, and the detection accuracy is improved.

Further, in the present invention, the temperature determining means is not more than the evaluation temperature value specified by the evaluation temperature parameter among the plurality of temperature values obtained by the temperature value calculating means, and The temperature value at which the difference from the value is minimum is determined as the detected temperature. For steam traps whose operating steam pressure can be specified and whose surface temperature can be empirically understood to be close to the saturated steam temperature for that pressure when operating normally, do not exceed the saturated steam temperature It is reasonable that this is a temperature value. Actually, there is a temperature difference due to heat radiation between the internal temperature and the surface temperature of the steam trap.If the piping from the steam supply source to the steam trap is long, the heat inside the steam trap itself will The temperature will be lower than the saturated steam temperature for the working steam pressure. According to the sixth aspect, the temperature detection suitable for such a situation is performed.

According to a seventh aspect of the present invention, there is provided a steam trap inspection apparatus comprising: a vibration sensor for detecting a vibration level of a steam trap as a temperature detection target; and the infrared temperature detector according to any one of the first to sixth aspects. An apparatus, comprising: a measurement unit to which at least the vibration sensor and the infrared detection unit are attached.

According to this configuration, the vibration level of the steam trap is detected, the intensity of infrared rays emitted from the steam trap is detected, and the operation state of the steam trap is diagnosed from these detected values.

[0021]

FIG. 1 schematically shows a steam trap inspection apparatus according to the present invention. As shown in this figure, the steam trap inspection device (hereinafter, abbreviated as an inspection device) is configured so that an operator can carry the inspection device main body 1 and inspect steam traps provided in various parts of a piping system of a plant. I have.

As shown in FIG. 1, the inspection apparatus main body 1 comprises a measuring device 2 and a processing device 3 connected to the measuring device 2 via a cable, and performs inspection while bringing the measuring device 2 into contact with the surface of the steam trap. And the obtained data is processed by the processor 3.

FIG. 2 functionally shows the configuration of the inspection apparatus. As shown in this figure, the measuring device 2 includes a vibration detecting unit 10 for detecting a vibration level of the steam trap, a temperature detecting unit (infrared ray detecting unit) 11 for detecting the temperature of the steam trap, and a measurement start switch 5 ( An input unit 12 having an OP key shown in FIG. 1) and a first central processing unit 13 for controlling the measuring instrument 2 are provided. The vibration detecting unit 10 and the like are provided to the first central processing unit 13. Each is connected. The transfer unit 14 includes the vibration detection unit 10 and the temperature detection unit 11
Is for transferring the respective detected data to the processor 3. The buffer 15 stores data before transfer.

The first central processing unit 13 includes timers TM1 and TM2 for regulating respective measurement times of vibration and temperature data.
TM3, a start determining unit 13a for determining ON / OFF of the measurement start switch 5, and timers TM1, TM2, TM
A timer control unit 13b for determining whether the time-up state of TM3 and the TM2 are in operation, and a transfer determination unit 1 for determining the end state of reception from the processor 3 in the transfer unit 14.
3c.

The vibration detecting section 10 includes a vibration probe 101 serving as a vibration detection portion of a steam trap, and a vibration sensor 102 including a piezoelectric ceramic element for generating a voltage corresponding to the intensity of vibration transmitted from the vibration probe 101.
A filter 103 for obtaining a signal of a desired frequency band from an input signal; an amplifier 104 for amplifying an output voltage from the vibration sensor 102 with a predetermined gain;
The A / D converter 105 converts the output of the A / D converter 105 into an analog signal, and outputs the converted value of the A / D converter 105 to the first central processing unit 13. As shown in FIG. 1, the vibration probe 101 protrudes from the tip of the measuring instrument 2 formed in a columnar shape.

The temperature detecting section 11 is an infrared detecting type radiant temperature sensor 11 which generates an electric charge according to the intensity of the infrared ray radiated from the surface of the steam trap.
1, an amplifier 112 for amplifying the output voltage of the radiation temperature sensor 111 with a predetermined gain, and an output of the amplifier 112
A / D converter 113 for performing an A / D conversion, an ambient temperature sensor 114 such as a thermistor for detecting a space temperature near the radiation temperature sensor 111, and an A / D converter for performing an A / D conversion on an output from the ambient temperature sensor 114 Device 115 and each A /
The two types of temperature data of the converted values (detected value 1 and detected value 2) of the D converters 113 and 115 are output to the first central processing unit 13.

The radiation temperature sensor 111 is disposed at the tip of the measuring instrument 2 and near the base end of the vibration probe 101. The radiation direction of the radiation temperature sensor 111 is such that the tip of the vibration probe 101 is directed to a steam trap. It is set so that the temperature of a specific portion of the steam trap can be detected in a state where the steam trap is in contact with the steam trap.

On the other hand, the processor 3 receives the vibration and temperature data transferred from the measuring
Receiving unit 21 to be stored in 0, inspection of steam trap,
A user input unit 22 including a plurality of keys for inputting information necessary for management, an evaluation temperature parameter and the like to be described later,
A display unit 23 formed of, for example, a liquid crystal display for displaying a diagnosis result and the like, a trap list storage unit 24 storing various information input by the user input unit 22, a plurality of preset infrared emissivities η1, An emissivity storage unit 25 including a plurality of storage areas H1, H2, and H3 for storing η2 and η3, and a plurality of infrared emissivities η1 and η
2, η3 are converted into temperature values t1, t2, t3, and the converted temperature values t1, t2, t3 are stored in a plurality of storage areas T1, T2, T3.
And a plurality of temperature values t1, t2, t obtained by the temperature value calculating unit 26 to obtain an evaluation temperature value from the evaluation temperature parameter.
3, a temperature determination unit 27 for determining the detected temperature td based on the evaluation temperature value and storing the detected temperature td in the storage area Td, and a recovery unit for diagnosing the condensate discharge state of the steam trap based on the detected temperature td. Water discharge diagnosis unit 2
8, a seal performance deterioration diagnosis unit 29 for obtaining a numerical value (seal performance deterioration value) representing a deterioration level of the valve closing performance (seal performance) of the steam trap based on the vibration data, and a processor 3
And a second central processing unit 30 that controls the entire system. The receiving unit 21 and the like are connected to the second central processing unit 30, respectively.

The central processing unit 30 includes a display determining unit 3 for determining the display state of the steam trap on the display unit 23.
0a, an input determining unit 30b for determining an input state in the user input unit 22, a registration determining unit 30c for determining a registration state of the steam trap in the trap list, and a transfer request from the measuring instrument 2 via the receiving unit 21. It has a transfer determining unit 30d for determining whether or not there is, and an η input determining unit 30e that functions in a modified example described later.

The condensate discharge diagnosing section 28 has a memory 28a for storing in advance a comparative temperature for diagnosing the condensate discharge state of the steam trap, the comparative temperature and the detected temperature t.
d and a comparing unit 28b for comparing d with d. In the present embodiment, the comparison temperature stored in advance in the memory 28a is an appropriate temperature tr1, an allowable temperature tr2, and a limit temperature tr3.
There are three types. Among them, the appropriate temperature tr1 is the temperature of the steam trap when the condensate is not retained, and is obtained based on the used steam pressure value. Allowable temperature tr
Reference numeral 2 denotes, for example, the temperature when the condensate temporarily stays, which is obtained based on the used steam pressure value.
The limit temperature tr3 is a boundary temperature between when the steam trap is in operation and when it is in rest. These specific numerical values are set for each steam trap.

The seal performance deterioration diagnosing section 29 calculates the seal performance deterioration value, ranks the seal performance based on the obtained seal performance deterioration value, records the results in the trap list, and stores the results in the trap list. It is stored in the storage unit 24.

Further, the processor 3 includes, as information necessary for inspection and management, for example, an area name (location place name) where a steam trap to be inspected exists, a steam trap identification number (trap number), Steam trap type name, manufacturer model (product name), classified by operating principle,
The used steam pressure (an example of the evaluation temperature parameter), the caliber, and the like are input, and this information is listed as data for each steam trap in the second central processing unit 30 (hereinafter, referred to as a trap list), and the trap list storage unit 24 Is stored in Then, each steam trap is directly registered in the processor 3, diagnosed, and the diagnostic result is sequentially recorded. The trap list refers to a data group for each steam trap having at least such information, and an example is shown in FIG.

Hereinafter, the method for determining the temperature in the present invention will be described. In this embodiment, the plurality of infrared emissivities are
The three types, η1, η2, and η3, are stored in advance in the emissivity storage unit 25 in the descending order of the infrared emissivity. For example, as the value of the infrared emissivity, η1 = 0.95 is stored in the storage area H.
1, η2 = 0.65 is stored in storage area H2, and η3 = 0.
45 are stored in the storage area H3 in advance.
The infrared emissivity of the steam trap differs depending on the material of the steam trap. Even if it is of the same type, it changes over time depending on the presence or absence of rust, and also differs with the coating material and the like, and depends on the so-called surface properties. However, except for glossy surfaces such as polished stainless steel, the
It is empirically known that data within the range of 0.45 can be obtained.

In the present embodiment, the above-mentioned used steam pressure is used as the evaluation temperature parameter. The used steam pressure input by the user input unit (functioning as an evaluation temperature parameter input unit) 22 is stored in the trap list.
The saturated steam temperature at the same pressure is ts, and the evaluation temperature value is αt
s. α is a coefficient that complements the difference between the internal temperature and the surface temperature of the steam trap, and is a value of 1 or less.

The detected value 1 (A / D converted value) is, specifically, temperature data in the vicinity of the radiation temperature sensor 111 inside the measuring instrument 2, which is detected by the ambient temperature sensor 114. This data is converted into a temperature value (t0) by the temperature value calculation unit 26 of the processor 3 and treated as an ambient temperature.

The detected value 2 (A / D converted value) means a difference value between the temperature near the sensor inside the measuring instrument 2 and the temperature of the object to be measured, which is output from the radiation temperature sensor 111.
The temperature value calculator 26 of the processor 3 converts this data into a temperature value and adds t0 to t1, t2, and t3. The converted temperature value t1 is stored in the storage area T1, and the converted temperature value t2 is stored in the storage area T2. , And the temperature value t3 are stored in the storage area T3. Here, the determination of the detected temperature td in the temperature determining section 27 is performed as follows, and the determined detected temperature td is determined.
d is stored in the storage area Td. Although the determination of the detected temperature td in the case of the temperature control trap is not described, a similar method is used.

The equation for calculating the temperature value from the infrared emissivity and the input temperature data basically follows the Stefan-Boltzmann law (radiant energy is proportional to the fourth power of the absolute temperature).

P = ησT ⁴ P: radiant energy T: absolute temperature η: energy emissivity σ: Stefan-Boltzmann constant In this embodiment, since a thermopile is used as an infrared sensor, Expression based.

[0039] P = ησT ⁴ -σT0 ⁴ T0: reference junction temperature (ambient temperature) Next, FIG. 4 to the testing device operation of the main body 1 and the specific examination procedure of the steam trap by the inspecting device body 1
This will be described with reference to the flowchart of FIG.

As a preparation for the inspection, the operator stores the trap list in the processor 3 in advance. In the inspection, the worker carries a piping drawing or a layout drawing indicating the positions of the inspection apparatus main body 1 and the steam trap, and performs the work.

First, the operator operates the user input unit 22 of the processor 3 to display the area name of the steam trap to be inspected and the identification number of the steam trap on the display unit 23, and grasps the measuring instrument 2 and vibrates. After the probe 101 is brought into contact with the surface of the steam trap, the measurement start switch 5
(12) is operated to start measurement.

In the measuring device 2, as shown in FIG. 4, the start determining unit 13a first determines whether or not the measurement start switch 5 (OP key) has been pressed (step S1).

In step S1, when the measurement start switch 5 (OP key) is pressed, the timers TM1, TM2 and TM3 in the first central processing unit 13 are set (step S2). Here, the timer TM1 is a vibration data detection time pitch, the timer TM2 is a temperature detection time, and the timer TM3 is a reference inspection time.
1 = 0.5 seconds, TM2 = 4 seconds, and TM3 = 10 seconds.

Then, in step S3, the timer control unit 13
It is determined whether or not the timer TM1 has timed out according to b. If the determination is YES, the vibration data is stored in the buffer 15 and the timer TM1 is set again (steps S3 to S5).

Next, it is determined by the timer control section 13b whether or not the timer TM2 is operating (step S6).
If determined to be S, the process proceeds to step S7 to determine whether or not the timer TM2 has timed out by the timer control unit 13b. Here, if it is determined as YES,
The timer TM2 is cleared, the detected value 1 and the detected value 2 are stored in the buffer 15 (steps S8 and S9), and
Move to 10.

If it is determined as NO at step S7, the process proceeds to step S3. If it is determined as NO in step S6, the timer control unit 1
It is determined whether or not the timer TM3 has timed out by 3b (step S10). If NO is determined, the process proceeds to step S3.

On the other hand, if YES is determined in step S10, the timers TM1 and TM3 are cleared (step S11), and the data transfer request signal to the processor 3 via the transfer unit 14 by the transfer determination unit 13c. Is output, the data stored in the buffer 15 is transferred to the processor 3 (steps S12 and S13). When the transfer determining unit 13c determines that the reception end signal of the data has been input to the measuring device 2 (step S14), the process proceeds to step S14.
The process goes to 1 and enters a standby state.

That is, the measuring device 2 detects vibrations of the steam trap at 0.5 second intervals, thereby
Based on the detection of 20 data per second, the temperature of the steam trap is detected 4 seconds after the start of measurement.

In contrast to the operation of the measuring instrument 2 as described above, in the processor 3, first, as shown in FIGS. 5 and 6, the display determining section 30a first checks the area name of the steam trap to be inspected and the steam trap. Display number 2
3 is determined (step S2).
1). Here, if NO is determined, an input request, that is, an input of an area name or the like by the user input unit 22 is awaited, and the input determination unit 30b determines the area name of the steam trap to be inspected and the identification number of the steam trap. It is determined whether or not an input has been made (step S22,
S23). If the determination in step S22 is NO, the process proceeds to step S21.

When YES is determined in the step S23, the registration judging unit 30c judges whether there is a corresponding steam trap in the trap list stored in the processor 3, and determines whether the corresponding steam trap exists. If there is any, the area name of the steam trap and the identification number of the steam trap are displayed on the display unit 23, and the process proceeds to step S21.
(Steps S24 and S25). If the determination is NO in step S23, the process proceeds to step S22.

If it is determined in step S24 that the corresponding steam trap is not included in the trap list, the input determining unit 30b determines whether a new registration input request has been made. Shifts to step S21 (step S26). On the other hand, YE
If determined to be S, the input determination unit 30b sequentially determines whether information such as the type name of the steam trap, the manufacturer model (product name), and the used steam pressure has been input (steps S27 and S28). Is determined, the trap list of the steam trap is newly created and stored in the trap list storage unit 24, and the area name of the steam trap and the identification number of the steam trap are displayed on the display unit 23. Step S2
1 (steps S29, S30).

On the other hand, the display judging section 30a determines in step S
If it is determined in 21 that the area name of the steam trap to be inspected and the identification number of the steam trap are displayed on the display unit 23, the transfer determination unit 30d issues a request to transfer vibration and temperature data from the measuring device 2 by the transfer determination unit 30d. It is determined whether or not there is, and if it is determined as YES, the data from the measuring device 2 is received and stored in the buffer 21, and a reception end signal is output to the measuring device 2 (steps S31 to S33). ). If NO is determined in step S31, the process proceeds to step S22.

Next, the temperature value calculating section 26 of the processor 3 calculates the temperature value t0 from the detected value 1 (step S3).
4). A temperature value t1 is calculated from the temperature value t0, the detection value 2, and the infrared emissivity η1 (step S35), and the temperature value t0 is calculated.
, The temperature value t2 is calculated from the detected value 2 and the infrared emissivity η2 (step S36), and the temperature value t3 is calculated from the temperature value t0, the detected value 2 and the infrared emissivity η3 (step S3).
7).

Next, the saturated steam temperature ts corresponding to the used steam pressure is read from the trap list by the temperature determining unit 27, an evaluation temperature value αts is obtained (step S38), and the temperature value t1 is stored in the storage area Td (step S3).
9). The temperature value t2 is compared with the evaluation temperature value αts, and when the temperature value t2 is smaller than the evaluation temperature value αts, the temperature value t2 is overwritten and stored in the storage area Td (steps S40 and S41). The temperature value t3 is compared with the evaluation temperature value αts, and when the temperature value t3 is smaller than the evaluation temperature value αts, the temperature value t3 is further overwritten and stored in the storage area Td (steps S42 and S43). On the other hand, the temperature value t
When 2 is larger than the evaluation temperature value αts, or when the temperature value t3 is larger than the evaluation temperature value αts, the process directly proceeds to step S44.

Then, the detected temperature stored in the storage area Td is read out to the condensate discharge diagnosis section 28 to diagnose the condensate discharge state (step S44). Next, whether or not a diagnosis result was obtained, that is, whether or not any one of the results of “normal”, “poor discharge”, and “pause or blockage” could be obtained as described later regarding the condensate discharge state Is determined, and if obtained, the result is displayed on the display unit 23 and recorded in the trap list.
1 (steps S45, S47, S48).

On the other hand, if the result of the diagnosis is not obtained in step S45, the vibration data among the data stored in the buffer 20 is read out to the seal performance deterioration diagnosis section 29 to obtain the seal performance deterioration value (step S46). Then, the rank and level of deterioration of the steam trap are displayed on the display unit 23 and recorded in the trap list, and the process proceeds to step S21 (steps S47 and S48).

Here, step S44 in FIG.
Will be described with reference to the flowchart of FIG.

In the inspection of the steam trap, first, the condensate discharge state of the steam trap is diagnosed by using the temperature data among the vibration and temperature detection data. The diagnostic method is
Although it differs slightly depending on the type of the steam trap based on the valve operating principle, a method of diagnosing a thermostatic steam trap will be described as an example.

First, in step S101, the detection temperature td is set in advance by the comparison section 28b of the condensate discharge diagnosis section 28 and the appropriate temperature tr stored in the memory 28a.
It is determined whether it is 1 or more. Here, in the case of YES,
At least it is determined that the condensate is discharged normally and the process returns. If NO, the process proceeds to step S102, and the comparing unit 28b determines whether or not the detected temperature td is equal to or higher than the allowable temperature tr2 (tr1> tr2) stored in the memory 28a.

Here, in the case of YES, it is determined that the steam trap is normal, that is, both the discharge state of the condensate and the sealing performance are good. That is, the reason why the detected temperature td is lower than the appropriate temperature tr1 and higher than or equal to the allowable temperature tr2 is when the condensed water normally stays as described above, and this means that the steam trap has not leaked. Means. Therefore, the steam trap is evaluated as “normal” without performing the processing for checking the sealing performance (step S103), and the process returns.

If NO in step S102, the process proceeds to step S104, and the comparing unit 28b determines whether the detected temperature td is equal to or higher than the limit temperature tr3 (tr2> tr3) stored in the memory 28a in advance. Here, in the case of YES, it is evaluated that a large amount of condensed water is retained in the steam trap, that is, it is "discharge failure" (step S105). In the case of NO, the steam trap is evaluated as “pause or blockage” (step S1).
06). That is, even when the steam trap is in the closed state, the detected temperature td is often lower than the allowable temperature tr3 in many cases, and it is not possible to distinguish between the pause and the closed state. Therefore, in this case, it is evaluated as “pause or occlusion”.

As described above, in the inspection of the steam trap using the inspection apparatus main body 1, the operator operates the user input unit 22 to display the identification number and the like of the target steam trap on the display unit 23. In this state, by bringing the measuring instrument 2 into contact with the surface of the steam trap, the temperature detection of the steam trap, the evaluation of the condensate discharge state, the rank of the sealing performance, and the like are automatically displayed on the display unit 23. The detected value, the seal performance deterioration value, the evaluation, the rank, and the like are recorded in the trap list and stored in the trap list storage unit 24.

Regarding the detected temperature value, for example, the steam trap in the trap list shown in FIG.
Assuming that the temperature was 100 ° C. when = 0.95, η2 =
It becomes 125 ° C at 0.65 and 150 ° C at η3 = 0.45. Assuming that α of the evaluation temperature value αts is 0.9, the saturated steam temperature with respect to the used steam pressure of 0.5 MPa is 158 ° C., so the evaluation temperature value αts is 142 ° C. Therefore, the detected temperature td is 150 ° C.
According to the temperature determination means of the sixth aspect, the detected temperature td is 125
° C.

As described above, according to the steam trap inspection apparatus of the present invention, at the time of inspection, the inspection apparatus main body 1 is carried, and the measurement start switch 5 is brought into contact with the measuring instrument 2 in contact with the steam trap. Is operated, the temperature detection value of the steam trap, the evaluation of the condensate discharge state, the seal performance deterioration value, the seal performance rank, and the like are automatically obtained, and these are displayed on the display unit 23 of the processor 3. You. Therefore, the temperature of the steam trap can be detected and the state of the steam trap can be evaluated with a very simple operation. At this time, in the present invention, there is no need for the operator to switch the sensitivity by switching the emissivity. Therefore, the temperature detection and the like can be simplified, and erroneous diagnosis due to a sensitivity switching error or the like can be prevented. Note that the measurement start switch 5 may be a mechanical switch that detects that the measuring device 2 has come into contact with the steam trap and automatically starts the inspection operation.

In the above embodiment, the temperature value is obtained by using the Stefan-Boltzmann equation based on the radiation temperature data detected by the measuring device 2. However, the calculation is performed by using the detected level value as it is. LUT with pre-fetched results
(Lookup table) may be used. In this case, each value in the table may be determined from the result of an experiment or the like. Further, the coefficient α of the evaluation temperature value αts is not limited to 1 or less.
Further, if necessary, a difference value tc is added to obtain αts−tc
May have the form

(Modification) In the above embodiment, three types of infrared emissivity are stored in advance, but an arbitrary value may be input from the user input unit 22 serving as an emissivity input unit. In this case, in FIG. 2, the η input determination unit 30e of the second central processing unit 30 functions, but the function is exerted in the input flow as shown in FIG. This input flow may be applied when “NO” is determined in step S24 in the flow of FIG. 5 of the above-described embodiment (that is, a new trap).

In FIG. 8, first, it is judged by the η input judging section 30e whether or not an infrared emissivity has been input (step S201). When it is judged that there is no input, the process returns to step S26 in FIG. 5, for example. However, when it is determined that an input has been made, it is determined whether η1 has been input (step S202). Then, the η input determination unit 30
When it is determined that η1 has been input by e, η1 is stored in the storage area H1 (step S203), and when it is determined that η1 has not been input, step S2 is performed as it is.
Move to 04.

Next, it is determined whether or not η2 has been input by the η input determination unit 30e (step S204). When it is determined that η2 has been input, η2 is stored in the storage area H2 (step S205), and when it is determined that η2 has not been input, step s206 is performed as it is.
Move to

Next, it is determined by the η input determining section 30e whether η3 has been input (step S206). When it is determined that η3 has been input, η3 is stored in the storage area H3 (step S207), and when it is determined that η3 has not been input, the routine returns.

As described above, a plurality of infrared emissivities are input from the user input unit 22, and the temperature value calculating unit 26 calculates the detected values of the infrared detecting unit 27 and the temperature values of the plurality of input infrared emissivities, respectively. If the value is converted into a value, the infrared emissivity can be freely set or changed depending on the material characteristics of the object, so that the detection accuracy can be further improved.

In the above-described embodiment and modified examples, only three types of infrared emissivity are set or input.
Of course, it is also possible to set the type or four or more types of infrared emissivity. In that case, the number of storage areas in the emissivity storage unit 25 and the number of storage areas in the temperature value calculation unit 26 are prepared according to the number of types of infrared emissivity.

In the above embodiment, the case where the infrared temperature detector is used for the steam trap inspection apparatus has been described. However, the application range of the infrared temperature detector is not limited to this.
For example, the present invention can be applied to any field in which non-contact temperature detection of a hot-rolled material or the like is preferable.

[0073]

According to the first aspect of the present invention, there is no need for the operator to switch the sensitivity by switching the emissivity. Therefore, temperature detection is simplified.

Further, according to the second aspect, the infrared emissivity can be freely set or changed depending on the material characteristics of the object, so that the detection accuracy can be improved.

Further, according to the third aspect, the setting of the evaluation temperature parameter can be simplified.

Further, according to the fourth aspect, the setting of the evaluation temperature parameter can be simplified. The fourth aspect of the present invention is suitable for an apparatus in which the operating temperature is set by adjusting a temperature-sensitive material such as a bimetal, such as a temperature control trap.

Further, according to the fifth aspect, the accuracy of the detected temperature can be further improved.

Further, according to the sixth aspect, the accuracy of the detected temperature can be made closer to the actual situation.

Further, according to the steam trap inspection apparatus of the seventh aspect, temperature detection is simplified, and erroneous diagnosis due to sensitivity switching error or the like can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a steam trap inspection apparatus according to the present invention.

FIG. 2 is a block diagram showing a functional configuration of the inspection device.

FIG. 3 is a diagram illustrating an example of a trap list.

FIG. 4 is a flowchart illustrating an overall operation of the measuring instrument at the time of inspection.

FIG. 5 is a flowchart illustrating an overall operation of the processor at the time of inspection.

FIG. 6 is a flowchart illustrating an overall operation of the processor at the time of inspection.

FIG. 7 is a flowchart illustrating a condensate discharge diagnosis of a processor at the time of inspection.

FIG. 8 is a flowchart illustrating an operation in a η input mode of the processor at the time of inspection according to a modified example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inspection apparatus main body 2 Measuring device (measuring part) 3 Processor 10 Vibration detecting part 11 Temperature detecting part (infrared detecting part) 111 Radiation temperature sensor 112 Amplifier 113 A / D converter 114 Ambient temperature sensor 115 A / D converter 12 Input unit 13 First central processing unit 14 Transfer unit 15 Buffer 20 Receiving unit 21 Buffer 22 User input unit (Evaluation temperature parameter input unit, Emissivity input unit) 23 Display unit 24 Trap list storage unit 25 Emissivity storage unit (Storage means) 26 temperature value calculation unit (temperature value calculation means) 27 temperature determination unit (temperature determination means) 28 condensate discharge diagnosis unit 29 seal performance deterioration diagnosis unit 30 second central processing unit

Claims (7)

[Claims] 1. An infrared temperature detector comprising an infrared detector for detecting the intensity of infrared rays emitted from a temperature detection target, wherein the infrared temperature detector detects a plurality of infrared emissivities corresponding to the surface properties of the temperature detection target. Storage means for storing; a temperature value calculating means for converting a detection value detected by the infrared detection unit into a temperature value for each of the plurality of infrared emissivities; and an evaluation temperature parameter for evaluating the temperature value. An evaluation temperature parameter input unit to input, an evaluation temperature value is determined using the input evaluation temperature parameter, and a detected temperature is determined based on the evaluation temperature value from among a plurality of temperature values obtained by the temperature value calculation means. An infrared temperature detector, comprising: a temperature determining means for determining the temperature. 2. An infrared temperature detector according to claim 1, further comprising an emissivity input section for inputting a plurality of infrared emissivities and loading the infrared emissivity into said storage means. 3. The temperature detection object is used under a constant steam pressure, and the evaluation temperature parameter input unit evaluates at least one of the used steam pressure value and a saturated steam temperature value with respect to the used steam pressure. 3. The infrared temperature detector according to claim 1, wherein the infrared temperature is inputted as a temperature parameter. 4. The temperature detection target is operated at a preset temperature, and the evaluation temperature parameter input section inputs the preset temperature value as the evaluation temperature parameter. The infrared temperature detector according to claim 1 or 2, wherein: 5. The temperature determining means detects a temperature value having a minimum difference from an evaluation temperature value specified by the evaluation temperature parameter among a plurality of temperature values obtained by the temperature value calculating means. The infrared temperature detector according to claim 1, wherein the temperature is determined as: 6. The temperature determining means, wherein, among the plurality of temperature values obtained by the temperature value calculating means, the temperature is equal to or less than an evaluation temperature value specified by the evaluation temperature parameter, and a difference from the evaluation temperature value is determined. The infrared temperature detector according to any one of claims 1 to 4, wherein a minimum temperature value is determined as the detected temperature. 7. A vibration sensor for detecting a vibration level of a steam trap as a temperature detection target, and a vibration sensor for detecting a vibration level of the steam trap as a temperature detection target.
A steam trap inspection apparatus provided with the infrared temperature detector according to any one of claims 1 to 3, wherein the steam trap inspection apparatus has a measurement unit to which at least the vibration sensor and the infrared detection unit are attached. .